Apparatus for collecting bronze dust from stamping mills



F. SPORER Dec. 10, 1929.

APPARATUS FOR COLLECTING BRONZE DUST FROM STAMPING MILLS Filed Jan. 28,1926 0 hdqlllQllldlQIll n mm .111 O JNVENTUR Mym Patented Dec. 10, 1929.

FRIEDRICH sroana, on

PATENT OFFICE NUREMBEIRG, GERMANY APPARATUS FOR COLLECTING BRONZE DUSTFROM STAMPING MILLS Application filed January 28, 1926, Serial No.84,417, and in Germany April 20, 1925.

In the bronze stamping mills of known type with arrangements for suckingoif the bronze dust from the stamping chamber and with pressure conduitfor conducting the sucked ofi' bronze dust through a collecting box, thefinest bronze dust drawn along is returned from the collecting box intothe stamping chamber. From the excessive pulverization resulting fromthe repeated stampng heating of this finest bronze particles is producedand consequently the production of annealing colours which impair thefine gloss of the stamping material. This finest bronze dust, which isrepeatedly returned into the stamping chamber filters through thenarrowest gaps produced by wearing around the ran'r rods, so that it isinhaled by the workmen.

According to the invention the impairing of the quality of the productand the danger to the health of the workmen are avoided by catching thefinest bronze dust drawn along from-the connecting box in a separatedust box which is connected with the end of a pressure conduit by meansof a removable hood of a material which is permeable to the air but notto the bronze dust.

An embodiment of the invention is shown, by way of example, in theaccompanying drawing in which Fig. 1 shows the improved bronze stampingmill in elevation.

Fig. 2 is a plan view of the same.

In the drawing, a designates a stamping chamber in which rams (notshown) are arranged in the form of a circle and work in the well knownmanner. The rod Z) of each of the said rams is guided in a bushing 0. Anair inlet tube d, which is connected with the 40 stamping chamber a isclosed by a flap f.

Opposite the air inlet (1 is a suction conduit 9 extending from thestamping chamber to a blower h. In the suction conduit 9 is an air holen adapted to be completely closed by means of a clip 0 which is tightlyfixed around the suction pipe 9 by means of a thumb nut p.

After the operation of stamping the'material has been completed, air issucked into the stamping chamber a through the open air inlet d by meansof the blower h. The air and the bronze dust are drawn from the stampingchamber a through the suction conduit g by the blower. h, which causesthe bronze dust to travel in a serpentine course over settling surfaces'5 in a collecting box is.

According to the invention a removable hood is dust tightly fixed on theend Z of the pressure conduit Z connected with the upper end of thecollecting box is, said hood being made from a material which ispermeable to the air but retains even the finest dust particles, forinstance fustian, said hood being adjustably fixed on the edge m of adust pot m.

As long as the stamping material has not yet reached the desired degreeoffineness, the air hole n in the suction'pipe 9 remains open, theblower it being, permanently operated. The flap f of the air inlet d isclosed. The blower h is of such a size that it has the tendency to suckin more air than can flow in through the hole a alone. In the stampingchamber a a sucking action is consequently produced, which although notbeing strong enough to draw along bronze powder is suflicient to producea feeble air current in the direction into the stamping chamber be tweenthe ram rods and the guide bushings 0 which are not constructed likestufiing boxes. These air currents blow back the bronze dust which hasthe tendency to escape through the annular gaps produced, after a shorttime of service, and retains this dust in the stamping chamber.

If the bronze powder is fine enough for sifting the air inlet flap f isopened and the hole n in the suction pipe is closed by the clip 0. Theair current which flows now with suflicient sucking force'through thestamping chamber a draws the bronze powder into the blower h, from whereit is forced into the collecting box is fitted with suitable depositingdevices. The fine bronze dust drawn aTong from the collecting box flowsthrough the pressurepipe Z and the filtering hood 9 into the dust pot m,as the material of which thehood is made, is impermeable to the dust butnot to the compressed air.

I claim A dust collector for bronze stamping mills including acollecting box for the bronze dust, a collector pot for the finestbronze dust 5 freely arranged behind said collecting box, a hood-shapedfilter adapted to cover air tight said collector pot and made of amaterial permeable to the air but impervious to the rfinest particles ofbronze dust, a conduit conmeeting said hood-shaped filter with the saidcollecting box and adapted to freely hold said hood shaped filter, ablower discharging into said collecting box, a suction conduit for saidblower, and an adjustable atmospheric 5 vent on said suction conduitadapted to regulate the air stream and the amount of bronze dust to beWithdrawn b said air stream.

In testimony whereo I aflix my signature.

FRIEDRICH SPORER.

